Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53fca3f09a684ff…

MALICIOUS

PDF

91.9 KB Created: 2021-06-27 23:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d717434d0b21bfa9c91940a31c01a333 SHA-1: ef1410b8163fa46d0e868ed09c4750679d37bea5 SHA-256: d53fca3f09a684ffa4f740c1bbc3635b712b86b23d2db97151e790a2c85c903f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external links suggests an attempt to redirect the user to malicious content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/8af8d8ababf8f43bdd96da7698b1e7a3/sixapadumosilazo.pdf In PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/f59cppulq95kh42pbubm34e4c1/23818746426.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/f47a9467ad1b22ceee9143932a749624/26340862634.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072112a5297e---57923035490.pdfIn PDF document text
    • https://chptravel.ir/data/file/67616252268.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/1bc598b39c32402615f592172d0c83a5/63277322256.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a732d3469bf---83819653634.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/c546737c5708dc6059ae5cfb64bdc150/zasewexoralusodenevabexa.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160ceeeda85119---zomuxuvi.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/16295393130.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cc1fa6763---71868179961.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/18594527507.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/5f67f536720ff3279dba6d13ab0c0ea0/bigijuwa.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16072ab9eed0c8---sogubometokibosava.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/e1c149b89b8797e96faae1e5702e2c0f/45749680902.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/cprgc67ufucm31orcmgqgao6n7/9083257306.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b27c0bae050---58612666134.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/otibj3n81l7e91drfvumcfu9pr/kodafetis.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a852458767f---rinalixijajofudod.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/osqg77v1lc1ghq1tu8pir7d0m3/10273626277.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/jujelijijegepixajuxawaku.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/c02gr1qidr3ksfjerjskdiju8k/zeluwim.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/35b3127cad6808cf5e93284ec53ce55b/tiwipovuvexomub.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/2a695d6e1e8f88eb49b8cef44f336ab3/53578204104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=theory+of+love+bl+novelPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F2 17756 bytes
SHA-256: 6afd9b14db7afc0d9ba6dae2c2f4aaa0353a867c480ff09b49c83b150b1f4e6a
font_01_sfnt_off00013422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13422 10072 bytes
SHA-256: 227d5f0fb24cca45bff56e3fafecac4fb187f6740025c3e6c62092e1a348a37f
font_02_sfnt_off00014a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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